73 lines
2.0 KiB
Rust
73 lines
2.0 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! Helper type with all filter state data.
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use std::{
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collections::{BTreeSet, HashSet},
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sync::Arc,
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};
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use ethereum_types::H256;
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use parking_lot::Mutex;
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use ethcore::filter::Filter;
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use v1::types::Log;
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pub type BlockNumber = u64;
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/// Thread-safe filter state.
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#[derive(Clone)]
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pub struct SyncPollFilter(Arc<Mutex<PollFilter>>);
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impl SyncPollFilter {
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/// New `SyncPollFilter`
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pub fn new(f: PollFilter) -> Self {
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SyncPollFilter(Arc::new(Mutex::new(f)))
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}
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/// Modify underlying filter
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pub fn modify<F, R>(&self, f: F) -> R where
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F: FnOnce(&mut PollFilter) -> R,
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{
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f(&mut self.0.lock())
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}
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}
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/// Filter state.
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#[derive(Clone)]
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pub enum PollFilter {
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/// Number of last block which client was notified about.
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Block(BlockNumber),
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/// Hashes of all pending transactions the client knows about.
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PendingTransaction(BTreeSet<H256>),
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/// Number of From block number, last seen block hash, pending logs and log filter itself.
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Logs {
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block_number: BlockNumber,
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last_block_hash: Option<H256>,
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previous_logs: HashSet<Log>,
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filter: Filter,
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include_pending: bool,
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}
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}
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/// Returns only last `n` logs
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pub fn limit_logs(mut logs: Vec<Log>, limit: Option<usize>) -> Vec<Log> {
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let len = logs.len();
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match limit {
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Some(limit) if len >= limit => logs.split_off(len - limit),
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_ => logs,
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}
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}
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